闭式重力热管的强化传热研究进展

重力热管具有传热性能优良、工作可靠、结构简单、制造方便、成本低廉、热流密度可变性、二侧热阻可调性等优点,使其应用领域不断增加。但随着能源的高效利用和强化传热技术的进一步发展,在某些特殊场合,普通重力热管满足不了传热和冷却的需求。为了从根本上提高管内的沸腾和凝结换热系数,提高重力热管的传热能力,科学研究者提出了多种强化传热的途径。文中主要从改变热管自身表面结构强化传热、热管内插件强化传热、多相流强化传热3个方面,综述了近年来闭式重力热管强化传热的途径及强化传热的效果,并对今后重力热管的强化传热研究的方向进行了展望。

Research progress in heat transfer enhancement in closed gravity heat pipe

Gravity heat pipe is widely used in many fields because of its high thermal conductivity,reliable working,simple structure,easy fabrication,low cost,changeable heat flux,flexible adjustable resistance on both sides of evaporation section and condensation section,etc.As the further development of energy efficient recovery and enhanced heat transfer technology,the ordinary gravity heat pipe is not able to meet the requirements of heating and cooling under the certain conditions.Many methods were investigated through many experiments to enhance the heat transfer in the closed gravity heat pipe radically.The latest development of heat transfer enhancement in the closed gravity heat pipe was summarized from the three fields: changing the structure of heat pipe,plugging the insertion piece,using multiphase fluid as working fluid,and the prospect of the further research on the heat transfer enhancement in closed gravity heat pipe was presented.